Typewriting machine



,50. govided on the plates 11- to form extende 'preferably of lead.

'Pientlmdi'lglzi i i g .1,592,392

UNITED 'STATES PATENT oFFIcE.ff

BUBNHAH o. STICXNEY, 01j' BUTHERFOBD, NEW JERSEY, ASSIGNOR 'ro UNnERwooDTXPEWBITEB COMPANY, oF NEW YORK, N. )LA CORPQBATIONDF ,DELAWARE mmmmeneame j v v animation inea menu, is'zs. serial No. eeesoaf. pThelgpresent invention relates to platane, o f the frame is a line-spaceratchet'ewlieeljl, fortypewriting machines, and to processes operable inany well-knownmanner by lineforniakingthe same. space mechanismgiotshown.` .A l l w Anobject ofthe inventiony is the roducvThe cylindricalor body portion of the 5 tion of a-platen, whichin use, may relaplatenhas right and left hand heads, end 00 tively noi'seless, and which,nevertheless, will pieces or collars 17 set upon hubs 18 secured assureclearness of type-impressions. by `setscrews;19 to the aide r10. Annulan'A featureof the` invention is a facin or flanges or`shoulders -20formed on the hubs jacket,gfor theplatenfof1a.v material, an sov 18serveA as ,outside abutments for theend lo constructed,fthatthe lsame,while substanpleces or collars 17; and nuts 21 threaded 65tlallyfnon-resonant-tothe impact of the type, into the opposed ends-ofthe hubs v18A hold is nevertheless ofthe hardness and iinpress-- the endApieces 17 againstthe abutments 20. t bility requisite.v forA cleartype-impressions. The hubs 18 are preferabl of metal, andthe In thepreferred embodiment' of the inven- "collars'l of some Soundeadeningmaterial,

l5 tion, the facing orglacketis built'up of rings such asrubber, toprevent transmission of `70 or annuli of compressed rawhide, setand se'-sound'from the cylindrical portion. f the cured'togetheriin amannerhereinafterdeplaten to the axle andjthence to theframe 7 scribed.n y y 7 v of the machine. As the rubber collarsare v further-feature? ofthe invention is' a pressed against the abutments 2Q b the nuts 20Aheavytubularfcore'of 'material such a's lead, 21, they are not only heldagainstlbngitud 75 in itself but'slightly resonant, for muilling'- .nalmovement on' the hubs 18, butl are com'- sound, and over which thecompleted jacket pressed in suoli 'a' manner as to bind firmly A migtbeslipped.'4 .v p upon the-hubs 18, and thusfbe heldagainst 1 her featuresofthe invention, -in the pre- `rotary displacement on the latter.Thejdi- -ferred Iform thereof, are; a tube of steel or aineter of thehubs 18 may be greater, andm'c other' metal serving/with the-heavy coreof the diameter of the collars 17 1ess",""tlan leadto'formj anlanvil suporting the blowsv shown; the idea being that` the hubs v18-and of thetypes andsound-ileadening winding the collars 17 together form theendpieces of soft rubberen the inner tube affording `a or supports for thecylinder, vand that a por7f so `yieldabl backing, for thelead tube;plugs tion of these end pieces between thecylinder V of'` rubber orotherv ielding sound-insulatand the axle is of sound-insulatingmaterial.v v ing'material inserte in the ends of the in-A Thecylinder'or platen proper ris formed vner tube for Ayieldiiiglysupporting the same in several tubular sections. The inner secand theheav lead tubefrom the axle 'ofthe tin is a tube 22, preferably ofsteel, copper gluten; and ubs orbushings of metal for or otherrelativelystrong and stilmaterial, olding-the yielding plugs and by meanssupported at its ends upon thecollars 17.

of which the platen as a whole may be fixed lThe collars 17 are SettightlyintoA Counter' against movementon its axle. sinks 23 in the endsof the tube 22. Where Other features and advantages will liereni Ithecollars 17 are f rubber, rota shp of 1 afterappear.f V' l l 4IiLtheaccompanying drawings, sistance is made assuredly effective bythe Figure1 is a view, in 'front elevation, of lateral compression of the collars1 7 bythe@l 1 a platen journaled .in the side Yplates of a nuts 21. j 7platen-frame;l the platen being partly broken In lthe preferred form of:the invention, a

45 away to show its interiorstructure. tube 24 is formed on the outsideo :E the tube 100` p F1 re 2 is a.' view in cross-section on the22.by.w1nd1ng 0I1 the latter, 111 vS111J6lpOS-ed line gil-2 of Figure1.' l layers, under tension, a continuous sheet o p The platen-axle 10is journaled in the side soft rubber. Oyer the tube l24: thus formedkplates 11 of a platen-frame; bosses 12 bein is snugly lsetstillanother. tube 25, which is 10.

rings for vthe aide 10. Securedfby set- .fThe surfacing sleeve, or thesleeve which screws `13 to the ends of the axle 10'are kthe is/thesurface against whiclithe typeestrlke, hubs or bosses 14 of hand-wheels15, is formed of a'series of rings or annuli'26 set means of, which the[laten may be rotate `:Ecce to.v face. This sleeve is preferably bnilt`5 secured to the ax eat the left-hand side orset together in fthe lrstinstance upqxi "'af 110 the tube 22 thereon is resisted, an this re- 95l their inner periphery.

mandrel. The opposing faces of the rings or annuli are cemented, andthus cemented are forced together under high pressure. The ringsthemselves are preferably of suiiciently hard rawhide, Originally, or asfirst put together, they may be of greater outer diameter thanthe-desired diameter of the platen; but, after being set together toform the sleeve, such sleeve may be turned down to the proper size. Asshown at 27 (Figure 2), the several rings or annuli, throughout theircircumference, and at relatively close intervals, are cut radially Thesecut-s are flor the purpose of giving the outer cylinder, as a whole, acertain resiliency and flexibility.

, The cuts, howeverwdo not extend so close to `ing of the platen, and

heavy lead being the outenperiphery of the cylinder as to unduly weakenthe latter.-

The bulkly lead tube contributes an element of weight,and the platen asshown in the drawings is therefore substantially heavier than anordinary laten. weight gives the platen t e nature of an anvil, which,by reason 'of its great inertia, supports or opposes the blows of thetypes, and

thus conduces to eiiiciency of the type-bars,

and favors clearness of type-impressions. The inking ribbon, beingpressed between the rapidlythrown type and the heavy inert platen, isfound' to be aiected in such a way that it-deposits ample ink upon thework-sheet, even when the touch upon the type-operating keys is light.The clearness,

evenn'ess and fullness of the inked type-impressions are due partly tothe overweightpartly to the use for this purpose of asubstantial leadtube, the a soft metal or impressible to an extent to yield somewhat atthe type blows, and Itending to'bring out clearly and evenly the entireoutline of the type upon the work-sheet. The soft, yielding support forthe lead tube, which may consist partly of the soft-rubber windings 24and partly of the soft-rubber bushin s or hubs 17, tends to prevent thelead from eing battered by the type blows or prevents excessiveresistance by the' lead tube to said blows. Besides all this, the leadtube is non-resonant and therefore quiet in o eration, and thesoft-rubber supports for t e lead tube conduce further to diminution ofsound.

One feature-of the invention pertains to thetrouble which in ordinarytypewriters arises from the use of thin, light and springy tyf'e-bars,most of whose types are 4much o et, and the use of light, hard, springylatens. The springy type-bar tends to reound from the. ordina springyplaten, and the force of the type low is disslpated without making aclear impression of the type, and the .type-bar also tends to strike t eplaten a second different place.- The heavy body `of lead outward from4The overtime and in a slightly illustrated herein, on the contrary,tends to -cause the desired work to be performed used up,\and the typestrikes 'only once, and,

by reason of the slight plastic, malleable` or impressible nature of theheavy lead, a clear impression is made. Easy and quiet operation andexcellence of prlnting are thus secured.

Owing to the weight of the lead tube, there isa tendency in rapidoperation for the platen to overthrow at the line-spacing operation, andby repeated shocks to Wear out or injure the line-space stop devices;but this tendency is substantially lessened by reason of theyielding orcushionin nature of the sound-insulating rubber p ugs 17, which areincluded in the platen-driving and arresting train.

The wear-resisting facing 26 prevents the lead from being cut by' thesharp types, but is itself ilexible and of a somewhat plastic orimpressible character, giving the dual result of c onducing to clearnessof type-impressions on the work-sheet and reducing the sound of the typeblows.

Variations may e resorted to within the scope of the invention, andportions of the improvements may be used without others.

. Having thus described my invention, l claim:

1. 'A platen for a typewriting machine, including a tube of lead 0requivalent nonresonant material, a-jacket or facing of rawhide therefor,anda relatively thin tube of steel or other metal on which thefirst-named tube is supported. V- v 2. A platen for a typewritingmachine, including a'tub'e of lead or e uivalent nonresonant material, ajacket or acing of-rawhide therefor, a tube ofA steel or other metal onwhich the rst-named tube is supported, and plugs of rubber or e uivalentsoundinsulating material inserted in the ends of the last-named tube,whereby to'support the platen on its axle.

3. A cylindrical platen for atylpewriting y machine, includin a tube ofstee or other metal, plugs of ru ber or e uivalent soundinsulatingmaterial inserte in the ends oi the tube, whereby to support the platenon its axle, a winding of soft rubber sheeting upon lthe tube, arelatively heavy tube of lead on the rubber winding, and a facin arketof compressed rawhide on the lea 4. A cylindrical platen for atypewriting machine, including a tube of steel or other metal,afg-windingl of soft rubber sheeting upon the tube, a relatively heavytube of lead on the rubber winding, Aand a facin aket of compressedrawhide on the lea (typewritiug machine,

including. a. core,

therefor, consisting of rin s or annuli of rawhide, set faceto faceanother along the core, to render the rawhide resilient on the core. X

6. A platen for a typewriting machine, including afsolid wall tube oflead, and a jacket or facing therefor, consisting of rings aterallyofone jacket yielding` and or annuli of `compressed rawhide fixed to bodone another face to face along the tubeand of a thickness tomaintain'the tubular shape i of the jacket.

`7. A platen for a typewriting machine, includin a weight in the form ofa heavy solid-wall tubular leaden core forming an anvil, and a facingjacket therefor of relatively hard resilient material.

8. A cylindrical typewriter laten including a heavy leaden tubular so idwall body forming an anvil, a yielding support whereby said body ismounted for rotation, and a wear-resistin facing for said body.

9. A cylingrical typewriter laten including a heavy leaden tubular soforming an anvil, a wear-resisting facing and interior-l scoredA platenaxle,

therefor, an axle for said platen, and ieldving rubber heads supportingsaid bo y on said axle.

10. A cylindrical typewriter platen body including an interior stifftube, soft rubber surrounding said tube, a substantial tube of deadforming an anvil upon said soft rubber, a wear-resistingl facin andyielding rubber sup orts for said body.

y11. A cy indrical typewriter platen bed or y, one portion of which is aheavylead tube forming an anvil, and another portion of which is softrubber in tubular form and extending along said lead tube, andcooperative therewith to support the typeblows, and a wear-resistingsheath or outer facing. t

12. A cylindrical ty ewriter platen comprising an overweighte metaltubular body, means for cushioning said body upon the and a flexibledurable covering for said body to protect the same from indentation bythe types, and to co-operate with said body to produce cleartype-impressions upon the work-sheet.

BURNHAM C. STICKNEY.

id wan body

